Why `kapt.mapDiagnosticLocations` is not enabled by default?

Recently I discovered kapt.mapDiagnosticLocations, which is a great addition to kapt and let me discover issues way faster - I’m not sure why this option is not heavily spread. I found it by chance…

Why isn’t this option enable by default? Does it has some type of side effect that I’m not aware of, like slower build times or something?

Thanks!